Energy loss in a fluctuating hydrodynamical background

Abstract

Recently it has become apparent that event-by-event fluctuations in the initial state of hydrodynamical modelling of ultrarelativistic heavy-ion collisions are crucial in order to understand the full centrality dependence of the elliptic flow coefficient v_2. In particular, in central collisions the density fluctuations play a major role in generating the spatial eccentricity in the initial state. This raises the question to what degree high P_T physics, in particular leading-parton energy loss, which takes place in the background of an evolving medium, is sensitive to the presence of the event-by-event density fluctuations in the background. In this work, we report results for the effects of fluctuations on the nuclear modification factor R_AA in both central and noncentral sqrt(s_NN) = 200 GeV Au+Au collisions at RHIC. Two different types of energy-loss models, a radiative and an elastic, are considered. In particular, we study the dependence of the results on the assumed spatial size of the density fluctuations, and discuss the angular modulation of R_AA with respect to the event plane.

9 pages, 9 figures

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• Jet quenching as a probe of the initial stages in heavy-ion collisions
• Enhancement of jet quenching around phase transition: result from the dynamical holographic model
• Energy dependence of the dijet imbalance in Pb-Pb collisions at 2.76 ATeV
• Event-by-event azimuthal anisotropy of jet quenching in relativistic heavy ion collisions
• Hard Probe of Geometry and Fluctuations in Heavy Ion Collisions at $\sqrt{s_{{}_{NN}}}=$ 0.2, 2.76, and 5.5 TeV
• How to test path-length dependence in energy loss mechanisms: analysis leading to a new observable
• Constraints from $v_2$ fluctuations for the initial state geometry of heavy-ion collisions
• Azimuthal anisotropy in a jet absorption model with fluctuating initial geometry in heavy ion collisions
• The Influence of Initial State Fluctuations on Heavy Quark Energy Loss in Relativistic Heavy-ion Collisions
• $Z^0$ boson associated b-jet production in high-energy nuclear collisions
• Effects of initial state fluctuations on jet energy loss
• Probing the mass effect of heavy quark jets in high-energy nuclear collisions
• Systematics of parton-medium interaction from RHIC to LHC
• D mesons in non-central heavy-ion collisions: fluctuating vs. averaged initial conditions
• Jet correlations - opportunities and pitfalls
• Monte Carlo Simulation for Elastic Energy Loss of Hard Partons in a Hydrodynamical Background
• Monte Carlo Simulation for Elastic Energy Loss of High-Energy Partons in Quark-Gluon Plasma